Owner
|
Type of Street
|
Right-of-Way Width
(feet)
|
Paved Width
(feet)
| |
---|---|---|---|
Collector
|
66
|
34
| |
Street
|
50
|
24
|
L = KA
| |
---|---|
This formula shall be used for both sag and crest vertical curves.
|
Q = A•ir
| ||||
---|---|---|---|---|
Where:
| ||||
Q
|
=
|
Discharge in cubic feet per second.
| ||
A
|
=
|
Tributary drainage area in acres.
| ||
i
|
=
|
Coefficient of runoff of the drainage area and shall be selected
in accordance with drainage area conditions but in no case will less
than the following values be accepted:
|
Zoning District
|
Hilly Terrain
|
Flat Terrain
| |
---|---|---|---|
Residence A
|
0.28
|
0.22
|
R =
|
120
t + 20
|
Where:
| ||||
---|---|---|---|---|
t
|
=
|
Time of concentration in minutes.
|
V =
|
1.486 x R 2/3 x S 1/2
N
|
Where:
| ||||
V
|
=
|
velocity in feet per second.
| ||
R
|
=
|
hydraulic radius in feet
| ||
n
|
=
|
0.015 for reinforced concrete pipe 18 inches in diameter or
less.
| ||
n
|
=
|
0.013 for reinforced concrete pipe larger than 18 inches in
diameter.
| ||
N
|
=
|
0.025 for earth ditches.
| ||
n
|
=
|
0.013 for paved ditches.
| ||
S
|
=
|
slope in feet per foot.
| ||
Design velocities shall be limited to three feet per second
minimum and 15 feet per second maximum.
|
Material
|
Sieve Size
(square openings)
|
Percent Passing by Weight
| |
---|---|---|---|
Broken stone
|
1/2 inch
|
100
| |
Broken stone
|
3/8 inch
|
50 to 100
| |
Sand and stone screenings
|
No. 4
|
30 to 70
| |
No. 10
|
22 to 45
| ||
No. 40
|
22 to 35
| ||
No. 80
|
7 to 20
| ||
No. 200
|
3 to 6
|
The normal asphalt content shall be 5% to 7 1/2% by weight
of total mix. The upper limit may be raised when using absorbative
aggregate. The coarse aggregate shall consist of clean, durable broken
stone showing a percent of wear when tested by the Deval method, ASTM
Designation D-2-33, or subsequent revisions, of not more than 3.5.
It shall show not over 10% loss when subjected to five cycles of a
sodium or magnesium sulphate soundness test, ASTM Designation C-88-41T,
or subsequent revisions. Coarse aggregate shall be considered to be
that portion retained on the No. 4 sieve. The fine aggregate shall
consist of clean, natural washed sand, rock sand or a combination
of any of these materials.
|